AS9120B, ISO 9001:2015, and FAA AC 0056B Accredited
Part #: 4554-1
NSN: NA
Manufacturer: Adams Rite Aerospace
Part Family: Aviation
Part Type: Hardware
Functionality of Door Latches: Door latches operate as a latch lock mechanism for opening and closing a translating motion-type aircraft door. The latch lock mechanism of this component includes a latch shaft that is mounted to the door by a set of follower bearings that are axially offset from the shaft. The shaft is rotated by a lift lock mechanism that includes a lift lock cam and a cam follower that tracks the cam, and a door drive linkage that is attached to the cam follower for rotating the latch shaft. The lift lock cam is rotated by a handle shaft that is actuated by a handle. When the handle is rotated, the lift lock cam is similarly rotated so as to cause the upward movement of the door drive linkage in the rotation of the latch shaft. A pressure vent door is selectively opened by an associated opener assembly connected to the handle shaft. In the event an attempt his made to open the door while the aircraft is in flight, the pressure vent door opener assembly locks out so as to inhibit movement of the handle shaft that would actuate the latch shaft and open the door.
FSG: Crew door latches are categorized under FSG 53 - Hardware and Abrasives.
FSC: Crew door latches are categorized under FSC 5340 - Hardware, Commercial.
Common Applications
Each door latch is customized to the application it is intended for. Latching can be in the form of a hook or bolt activated by a lever or D-ring. The system must allow fore and aft movement of the door when open as well as translational movement for the initial phase of locking or unlocking. The system must be able to draw the door inward to the aircraft when closing. This change in direction from fore and aft to inward and outward is when the system must engage mating points, draw the door inward, compress a seal and secure the door.
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